I'll certainly have more observations as I dig more into The Rust Book and Rust by Example on #RustLang, but it is interesting to me to see the baked in assumption that you are pretty comfortable with concepts like package management (I mean Rust By Example talks about creating a library before it talks about using a library and The Rust Book is similar, glossing over nuances here), CLI tools, and build tools.
To be clear, this is all fine, it is just informing me who the target audience is.